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Cells Ch 1

Cell discovery and Organelles

Robert Hooke 1st to describe cells; Looked at cork cells; 1665
Anton van Leeuwenhoek 1673; looked at yeast, animal blood, pond scum, and bacteria
3 parts of cell theory 1) All organisms are made from one or more cells 2) The cell is the basic unit of life 3) All cells come from cells
Surface area-to-volume ratio Limits the size of cells because they have to be able to get nutrients in and waste products out
2 things cells must do to survive 1) Take in nutrients 2) Get rid of wastes
organelles structures inside the cells that perform their specific functions to keep the cell productive
prokaryote a single-celled organism which does not have a nucleus in its cell; bacteria is an example
eukaryote a multi-celled organism which has nuclei in its cells; plants and animals are examples (including humans)
DNA unique genetic information which is read by the ribosomes and stored in the nucleus of the cell; the instructions of the cell
Do you know the organelles and their jobs? yes
3 advantages of being multicellular 1) larger size (fewer predators) 2) longer life (life goes on when a cell dies) 3) cells can specialize (more complex organisms)
cells the basic unit of life; the simplest level of organization
tissue cells work together to perform a certain funtion
organ tissues work together to perform a certain function
organ systems organs work together to perform a certain function
structure the shape, form, or arrangement of the parts of an organism
function the job of a part of an organism
levels of organization of living things cells --> tissues --> organs --> organ systems (--> organism......if it is multicellular)
surface area area outside the cell covered by cell membrane; good for letting materials in and out
volume area inside the cell; not good if too big because more nutrients are needed and more waste must get out
Created by: browngdavid



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